🛠️ Refactor OAuth proxy server to improve configuration validation, logging, and middleware setup

code/websites/pokedex.online/server/oauth-proxy.js

@@ -6,7 +6,7 @@
  *
  * Usage:
  *   Development: node server/oauth-proxy.js
- *   Production: Deploy as serverless function or Express app
+ *   Production: Deploy with Docker (see docker-compose.production.yml)
  */
 
 import 'dotenv/config';
@@ -14,39 +14,24 @@ import express from 'express';
 import cors from 'cors';
 import fetch from 'node-fetch';
 import gamemasterRouter from './gamemaster-api.js';
+import { validateOrExit, getConfig } from './utils/env-validator.js';
+import logger, { requestLogger, errorLogger } from './utils/logger.js';
+import { setupGracefulShutdown, createHealthCheckMiddleware } from './utils/graceful-shutdown.js';
+
+// Validate environment variables
+validateOrExit();
+
+// Get validated configuration
+const config = getConfig();
 
 const app = express();
-const PORT = process.env.OAUTH_PROXY_PORT || 3001;
 
-// Environment variables (set in .env file)
-const CLIENT_ID = process.env.CHALLONGE_CLIENT_ID;
-const CLIENT_SECRET = process.env.CHALLONGE_CLIENT_SECRET;
-const REDIRECT_URI =
-  process.env.CHALLONGE_REDIRECT_URI || 'http://localhost:5173/oauth/callback';
-
-// Validate required environment variables
-const hasChallongeAuth = CLIENT_ID && CLIENT_SECRET;
-if (!hasChallongeAuth) {
-  console.warn('⚠️  Challonge OAuth credentials not configured:');
-  console.warn('   CHALLONGE_CLIENT_ID');
-  console.warn('   CHALLONGE_CLIENT_SECRET');
-  console.warn('\nChallonge OAuth endpoints will be disabled.');
-  console.warn('Gamemaster API will still work.\n');
-}
-
-app.use(
-  cors({
-    origin:
-      process.env.NODE_ENV === 'production'
-        ? process.env.FRONTEND_URL
-        : [
-            'http://localhost:5173',
-            'http://localhost:5174',
-            'http://localhost:5175'
-          ]
-  })
-);
+// Middleware
+app.use(cors({ origin: config.cors.origin }));
 app.use(express.json());
+app.use(requestLogger);
+
+// Mount API routes
 app.use('/api/gamemaster', gamemasterRouter);
 
 /**